Be sure your HEPA vacuum is certified! The Dustless Technologies HEPA Vacuum is certified and provides many benefits not found in other vacuums. A lot of manufacturers claim to have a HEPA vacuum, but many are not certified. If an EPA inspector walks onto your job site, and your HEPA vacuum is not certified, you can be fined up to $32,500. The Micro Pre-filter makes this vacuum very cost-efficient to use over time because of how it extends the life of the HEPA filter. It captures particles down to 0.5 micron very close to the HEPA filtration of 0.3 micron. Because the HEPA filter is used for just the tiniest of particles, it can last up to 30 times longer when used with a Micro Pre-filter. The Dustless HEPA Wet/Dry Vacuum can be used to vacuum up water without fear of getting your valuable HEPA filter wet. A baffle wall inside the canister keeps water from reaching the HEPA filter, under normal operation. Go back and forth between wet and dry operation without stopping to change filters or make other adjustments. This vacuums emits only 81 decibels of noise, has a powerful 5 hp motor, runs at 24,140 RPMs and produces 76.9 In. water lift at 126.CFM. A 16 gallon canister and Micro Pre-filter bag support optimum air flow while holding up to 40 lbs of dirt and debris.